利用php CI force_download($filename, $data) 下载.csv 文件解决文件名乱码，文件内容乱码

  利用php CI force_download($filename, $data) 下载.csv 文件解决文件名乱码，文件内容乱码。做了很久终于知道了很好的解决方案。

  1.加载辅助函数

$this->load->helper('download');  //下载辅助函数
$this->load->helper('string');    //字符编码转换辅助翻书

 2.force_download($filename, $data)通过它的代码可以知道$data 必须是字符串，如果不是字符串会出错的。是数组，必须转换成字符串，用函数implode即可，该函数用法见官网，更具我的项目代码如下。

public function download() {
	      // 输出Excel文件头
	     //解决IE,firework等浏览器文件名乱码问题
		$filename = '已拆回款数据.csv';
		$newarray=array();该结果是一个二维数组
		if ($this->input->get () !== false) {
			$conn = $this->getformdata ();
		}
		// 输出Excel列名信息
		$head = array (
				'ID',
				'回款号',
				'回款金额(分)',
				'调整渠道成本',
				'回款时间',
				'导入SO时间',
				'渠道名称',
				'合同ID' 
		);
		foreach ( $head as $i => $v ) {
			// CSV的Excel支持GBK编码，一定要转换，否则乱码
			 $head [$i] = utf2gbk($v);
		}
		$newarray[]=implode(',',$head);
		$sql = "select * from sinapay_boss_income where {$conn} order by income_status asc, boss_income_id desc";
		$query = $this->db->query ( $sql );
		// 计数器
		$cnt = 0;
		// 每隔$limit行，刷新一下输出buffer，不要太大，也不要太小
		$limit = 8000;
		foreach ( $query->result_array () as $row ) {
			$cnt ++;
			if ($limit == $cnt) { // 刷新一下输出buffer，防止由于数据过多造成问题
				ob_flush ();
				flush ();
				$cnt = 0;
			}
			// 读取表数据
				$content = array ();
				$content [] =$row ['boss_income_id'];
				$content [] =$row ['income_num'];
				$content [] =$row ['income_amount'];
				$content [] =$row ['modified_cost'];
				$content [] =$row ['income_date'];
				$content [] =$row ['write_so_month'];
				$content [] =utf2gbk($row ['channel_name']);
				$content [] =utf2gbk($row ['income_contract_id']);
			$newarray[]=implode(',',$content);
		}
		$newarray=implode("\n",$newarray);
		force_download($filename, $newarray); 
	}
} 

3.测试后我发现ie浏览器文件名是乱码，firefox 浏览器文件名也是乱码。于是对辅助函数做了以下的修改，以下加了背景颜色的代码是我添加的。

if ( ! function_exists('force_download'))
{
	function force_download($filename = '', $data = '')
	{
		if ($filename == '' OR $data == '')
		{
			return FALSE;
		}
		//ie 浏览器解决文件名是乱码
		$filename = urlencode($filename);
               $filename = str_replace("+", "%20", $filename);
		// Try to determine if the filename includes a file extension.
		// We need it in order to set the MIME type
		if (FALSE === strpos($filename, '.'))
		{
			return FALSE;
		}
	
		// Grab the file extension
		$x = explode('.', $filename);
		$extension = end($x);

		// Load the mime types
		@include(APPPATH.'config/mimes'.EXT);
	
		// Set a default mime if we can't find it
		if ( ! isset($mimes[$extension]))
		{
			$mime = 'application/octet-stream';
		}
		else
		{
			$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
		}
	
		// Generate the server headers
		if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
		{
			header('Content-Type: "'.$mime.'"');
			header('Content-Disposition: attachment; filename="'.$filename.'"');
			header('Expires: 0');
			header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
			header("Content-Transfer-Encoding: binary");
			header('Pragma: public');
			header("Content-Length: ".strlen($data));
		}elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Firefox")){   //解决firefox 文件名乱码
			header('Content-Type: "'.$mime.'"');
			header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"');
			header('Expires: 0');
			header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
			header("Content-Transfer-Encoding: binary");
			header('Pragma: public');
			header("Content-Length: ".strlen($data));
		}else
		{
			header('Content-Type: "'.$mime.'"');
			header('Content-Disposition: attachment; filename="'.$filename.'"');
			header("Content-Transfer-Encoding: binary");
			header('Expires: 0');
			header('Pragma: no-cache');
			header("Content-Length: ".strlen($data));
		}
	
		exit($data);
	}
}

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